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Network World: The Practicality of Open Source NAC Developers

"Developers of open source NAC products are a very practical
lot. They use existing open source software to back end the
NAC-specific code they write.

"So if they want to implement post-admission NAC that monitors
the behavior of devices once they are admitted to networks and
kicks them off if they misbehave, they often base it on Snort, the
free intrusion detection platform..."